When you set
skinparam defaultFontName <fontname> ...
everything seems to change except for the font of the label for the partition. I've tried specifying the partition font using the new syntax described here and it works fine except for the FontName parameter. it is as if the label's font is hard-coded.
p.s. I love the application.

8033. I've tried the 'skinparam partitionFontName' in your PlantUML server and it seems to work, though I can't, of course, try it with my local fonts. I've tried the same with 8041, but that is, again a hosted version. I upgraded my local version to the latest version and it worked fine. Thanks for the help. It looks as the bug was fixed between 8033 and now!

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For consistency it would be perfect to have all relevant parameters of elements styleable without a separate table of styleable parameters in the PlantUML specification.
For example: If a "package" element is styleable, so a "partition" element is implicitly styleable the same way.